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Piston-Ring.

Description: Patent for metallic piston rings to allow for expansion and contraction without leakage.
Date: June 15, 1920
Creator: Jordan, Robert M.
Partner: UNT Libraries Government Documents Department

Rail Joint and Brace.

Description: Patent for an improvement to rail joint structures that extends structural longevity by bracing the rails against each other.
Date: June 1, 1920
Creator: Buck, Landon A.
Partner: UNT Libraries Government Documents Department

Adjustable Colter-Clamp

Description: Patent for a colter clamp that may be fastened to a plow beam. Illustrations included.
Date: June 11, 1907
Creator: Allin, Joseph H.
Partner: UNT Libraries Government Documents Department

Clothes-Pin

Description: Patent for clothes pin with illustration attached. This pin was created to allow ease shifting of clothes hanging from the clothe line. Additionally the clothes pin does not pinch the clothes it holds in place.
Date: June 12, 1917
Creator: McKinney, Arthur C.
Partner: UNT Libraries Government Documents Department
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